<!DOCTYPE html>
<html lang="utf-8">
<head>
    <meta charset="utf-8">
    <title>Vue.js导航菜单</title>
    <script src="../js/vue.min.2.7.0.js"></script>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        body {
            font: 15px/1.3 'Open Sans', sans-serif;
            color: #5e5b64;
            text-align: center;
        }

        a, a:visited {
            outline: none;
            color: #389dc1;
        }

        a:hover {
            text-decoration: none;
        }

        section, footer, header, aside, nav {
            display: block;
        }

        nav {
            display: inline-block;
            margin: 60px auto 45px;
            background-color: #5597b4;
            box-shadow: 0 1px 1px #ccc;
            border-radius: 2px;
        }

        nav a {
            display: inline-block;
            padding: 18px 30px;
            color: #fff !important;
            font-weight: bold;
            font-size: 16px;
            text-decoration: none !important;
            line-height: 1;
            text-transform: uppercase;
            background-color: transparent;

            -webkit-transition: background-color 0.25s;
            -moz-transition: background-color 0.25s;
            transition: background-color 0.25s;
        }

        nav a:first-child {
            border-radius: 2px 0 0 2px;
        }

        nav a:last-child {
            border-radius: 0 2px 2px 0;
        }

        nav.home .home,
        nav.projects .projects,
        nav.services .services,
        nav.contact .contact {
            background-color: #e35885;
        }

        p {
            font-size: 22px;
            font-weight: bold;
            color: #7d9098;
        }

        p b {
            color: #ffffff;
            display: inline-block;
            padding: 5px 10px;
            background-color: #c4d7e0;
            border-radius: 2px;
            text-transform: uppercase;
            font-size: 18px;
        }
    </style>
</head>
<body>
<div id="app">
    <nav v-bind:class="active" v-on:click.prevent>
        <a href="#" class="home" @click="makeActive('home')">home</a>
        <a href="#" class="projects" @click="makeActive('projects')">projects</a>
        <a href="#" class="services" @click="makeActive('services')">services</a>
        <a href="#" class="contact" @click="makeActive('contact')">contact</a>
    </nav>
    <p>你选择了 <b>{{ active }}</b> 菜单</p>
</div>
<script>
    new Vue({
        el:'#app',
        data:{
            active: 'home'
        },
        methods:{
            makeActive(item){
                this.active = item
            }
        }
    })
</script>
</body>
</html>